Merge pull request #6 from dengemann/fix_ctf_comp

layout and ICA fixes
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ENH : new make html-noplot for faster doc build + update logo with all logos
Merge pull request #897 from mluessi/fix_ctf_comp

FIX: Keep MEG reference channels
Merge pull request #902 from agramfort/doc_update

ENH : new make html-noplot for faster doc build + update logo with all logos
Merge pull request #906 from dengemann/ipy_notebook_support

WIP/ENH: pyplot internals
FIX bug when selecting source for source spectrograms
Merge pull request #908 from rgoj/fix-source-spectrogram-source-index

FIX bug when selecting source for source spectrograms
ENH: more travis tweaks
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